Hydrophilic and oleophobic polymer

A polymer comprising:

• structural units A derived from at least one selected from the group consisting of ethylene and propylene;
• structural units B represented by a formula (1) below;
• and structural units C represented by a formula (2) below,
• wherein
• R1 represents a hydrogen atom or a methyl group;
• L11 represents —CO—O—, —O—CO—, or —O—;
• L12 represents a single bond, —CH2—, —CH2—CH2—, —CH2—CH2—CH2—, —CH(CH3)—CH2—, —CH2—CH(CH3)—, —CH2—CH(OH)—CH2—, or —CH2—CH(CH2OH)—;
• L13 represents a single bond, —CO—O—, —O—CO—, —O—, —CO—NH—, —NH—CO—, —CO—NH—CO—, —NH—CO—NH—, —NH—, or —N(CH3)—;
• L16 represents —(CH2)n—(Rf2O)p—Rf1;
• Rf1 represents a C1-15 alkyl group having one or more hydrogen atoms thereof substituted with one or more fluorine atoms;
• Rf2 represents a C1-15 alkylene group having one or more hydrogen atoms thereof substituted with one or more fluorine atoms;
• p represents an integer of 0 to 15, and n represents an integer of 0 to 10;
• when p is an integer of 2 or greater, a plurality of moieties —(Rf2O)— may be identical or different;
• and
• in L11, L12, and L13 each representing a horizontally written chemical formula, a left side of the horizontally written chemical formula corresponds to an upper side of the formula (1), i.e., a main-chain side of the polymer, and a right side of the horizontally written chemical formula corresponds to a lower side of the formula (1), i.e., an end side of a side chain of the polymer, and
• wherein
• R2 represents a hydrogen atom or a methyl group;
• L21 represents —CO—O—, —O—CO—, or —O—;
• L22 represents a single bond, —CH2—, —CH2—CH2—, —CH2—CH2—CH2—, —CH(CH3)—CH2—, —CH2—CH(CH3)—, —CH2—CH(OH)—CH2—, or —CH2—CH(CH2OH)—;
• L23 represents a single bond, —CO—O—, —O—CO—, —O—, —CO—NH—, —NH—CO—, —CO—NH—CO—, —NH—CO—NH—, —NH—, or —N(CH3)—;
• L26 represents —(CH2)n—(Rr2O)q—Rr1;
• Rr1 represents a hydrogen atom or a C1-15 alkyl group;
• Rr2 represents a C1-15 alkylene group;
• q represents an integer of 0 to 1000000, and n represents an integer of 0 to 10;
• when q is an integer of 2 or greater, a plurality of moieties —(Rr2O)— may be identical or different;
• and
• in L21, L22, and L23 each representing a horizontally written chemical formula, a left side of the horizontally written chemical formula corresponds to an upper side of the formula (2), i.e., the main-chain side of the polymer, and a right side of the horizontally written chemical formula corresponds to a lower side of the formula (2), i.e., an end side of a side chain of the polymer.